Ayat 12. And on the Day when the Hour will be established, the Mujrimun (disbelievers, sinners, criminals, polytheists, etc.) will be plunged into destruction with deep regrets, sorrows, and despair.

Ayat 13. No intercessor will they have from those whom they made equal with Allah (partners i.e. their so called associate gods), and they will (themselves) reject and deny their partners.

Tafseer of Surah Al Rum (The Romans) Ayat 12 and 13. On the Day that the Hour will be established, the guilty will be struck dumb with despair. The Hour will be established: in due time the Hour will come when Judgment will be established, and the seeming disturbance of balance in this world will be redressed. Then the Good will rejoice, and the Guilty, faced with the Realities, will lose all their illusions and be struck dumb with despair. 13. No intercessor will they have among their "Partners", and they will (themselves) reject their "Partners". False worship will then appear in its true colors. Anything to which we offered the worship due to Allah alone, will vanish instead of being of any help. Indeed the deluded false worshippers, whose eyes will now be opened, will themselves reject their falsehoods, as the Truth will now shine with unquestioned splendor.